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-2(5-x)=100
We move all terms to the left:
-2(5-x)-(100)=0
We add all the numbers together, and all the variables
-2(-1x+5)-100=0
We multiply parentheses
2x-10-100=0
We add all the numbers together, and all the variables
2x-110=0
We move all terms containing x to the left, all other terms to the right
2x=110
x=110/2
x=55
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